These days, they’re usually racks and racks and racks of specialized rackmount servers with all kinds of hardware, hilarious amounts of ram, networked storage, tensor cores, etc stuffed inside, all networked together via fiber optics to run in parallel as one big PC with many CPUs.
Superconputers to me refer to the mainfrane room sized monstrosities that are focused on stuff like calculating ballistic trajecories in the cold war
These days, they’re usually racks and racks and racks of specialized rackmount servers with all kinds of hardware, hilarious amounts of ram, networked storage, tensor cores, etc stuffed inside, all networked together via fiber optics to run in parallel as one big PC with many CPUs.